When I raise the bucket all the way up and leave it in this position, over a period of several minutes, it will come down, all though gradually. The tilt cylinder may stay in position for day; if I have the bucket down and curled so that the front tires are up off the ground. It does have new seals in it. The lift cylinders don't show any external hydraulic fluid leaks. Another thing is the machine won't lift a loaded pallet weighing one ton.